(CNN) -- Polish President Lech Kaczynski was killed early Saturday along with his wife, several top military officials, and the head of the national bank when their plane crashed at a western Russian airport, officials said."There are no survivors," said Sergey Antufyev, the governor of Smolensk, where the plane was trying to land when it crashed. Russian emergency officials said 97 people died. Kaczynski was 60.Parliament Speaker Bronislaw Komorowski took over as acting president and declared it "a time for national mourning."Prime Minister Donald Tusk said the country would hold two minutes of silence at midday Sunday for the victims. Russia has declared Monday as a day of mourning.